package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //发送验证码
        if(!RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //创建一个手机号
        String code= RandomUtil.randomString(6);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code, LOGIN_CODE_TTL,TimeUnit.MINUTES);
        System.out.println("发送验证码成功,验证码:"+ code);
        // 确认验证码是否成功写入
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm,HttpSession session){
        //登录
       String phone=loginForm.getPhone();
       if(!RegexUtils.isPhoneInvalid(phone)){
           return Result.fail("手机号格式错误");
       }
        String cachecode=stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code=loginForm.getCode();
        if(cachecode==null||!cachecode.equals(code)){
            return Result.fail("验证码错误");
        }
        User user =query().eq("phone",phone).one();
        if(user==null){
            user=createUserWaitPhone(phone);
        }
        String token=UUID.randomUUID().toString(true);
        UserDTO userDTO= BeanUtil.copyProperties(user,UserDTO.class);
        Map<String, Object> userMap=BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        String tokenkey= "login:token:"+token;
        stringRedisTemplate.opsForHash().putAll(tokenkey,userMap);
        stringRedisTemplate.expire(tokenkey,300000L,TimeUnit.MINUTES);
        log.debug(token);
        return Result.ok(token);

    }

    @Override
    public Result sign() {
        //签到
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //签到计数功能
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = "sign:" + userId + keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result==null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null || num==0){
            return Result.ok(0);
        }
        int count=0;
        while(true){
            if((num&1)==0){//6.2.判断这个bit位是否为0
                break;
            }else{
                count++;
            }
            num >>>= 1;
        }
        return Result.ok(count);
    }
    private User createUserWaitPhone(String phone) {
        User user=new User();
        user.setPhone(phone);
        user.setNickName("user_" +RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
